A proposed change to the town’s historic properties regulations would expand the historical commission’s review time from 30 to 65 days and extend protection for preferably preserved properties from six to 18 months.

The proposal, which is part of the council’s Dec. 20 agenda, was developed through the Barnstable Historical Commission, with the assistance of growth management staff.

Cotuit councilor Jessica Rapp Grassetti, who also serves as chair of the historical commission, sponsored the item.

In addition to the above changes, a new paragraph that commission determinations expire after two years is proposed. The effect of the new language would be to require a new determination by the historical commission on the same property after 24 months had elapsed.

The item is expected to be referred to a public hearing before the council on Jan. 3.